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    John Walker

    fourmilab.ch · Personal blog · on HN since 2007

    John Walker, Autodesk co-founder, runs Fourmilab, a personal site covering science, software, random number generation, and The Hacker's Diet.

    Visit blogHN submissions
    ScienceProgrammingHealth
    What HN says

    Commenters praise it as a fantastic, hand-crafted science site, and cite The Hacker's Diet as a model for simple, documentation-style guides.

    Stats for nerds
    447HN people shared it
    176linked in comments
    4Kstory points
    Mar 2026last shared
    2020people per year2026

    Top posts on HN

    1. 1
      Golden Rules for Making Money (1880)
      4 people · 587 points · first shared 2008 · 191 comments on HN
    2. 2
      Golden Rules for Making Money (1880)
      9 people · 437 points · first shared 2007 · 180 comments on HN
    3. 3
      What Gives Gold that Mellow Glow? (2006)
      10 people · 243 points · first shared 2009 · 23 comments on HN
    4. 4
      Bending Spacetime in the Basement (1997)
      6 people · 240 points · first shared 2015 · 58 comments on HN
    5. 5
      The Hacker's Diet (2005)
      67 people · 219 points · first shared 2007 · 77 comments on HN
    6. 6
      The Internet Slum: is abandoning the Internet the next big thing? (2004)
      3 people · 213 points · first shared 2021 · 274 comments on HN
    7. 7
      Neural Network on a Commodore 64 (1987)
      5 people · 184 points · first shared 2017 · 21 comments on HN
    8. 8
      The Hacker's Diet
      17 people · 132 points · first shared 2007 · 53 comments on HN
    9. 9
      A rocket a day keeps the high costs away (1993)
      1 person · 131 points · first shared 2024 · 96 comments on HN
    10. 10
      Nitrogen Triiodide (2016)
      1 person · 103 points · first shared 2025 · 57 comments on HN

    What HN people wrote when they linked it

    • cletusJul 2021

      This sounds appealing but there are a couple of major problems.

      The first is that you have to get to a significant percentage of light speed for this to manifest itself. Even at 0.95c time is only traveling at 1/3 of normal speed [1].

      Second, the energy cost for this is truly mind-boggling. Doing so when you carry the fuel seems highly impractical. The best bet are laser highways [2]. But, you need to build that first.

      The upper limit of laser propulsion isn't really high enough for that level of time dilation.

      Third, traveling at these speeds makes any potential impact within even a speck of dust potentially fatal.

      Lastly, fun fact: such a ship actually needs to be aerodynamic. Why? Above 0.95c the drag of hydrogen atoms in the interstellar medium will start to slow you down.

      [1]: https://www.fourmilab.ch/cship/timedial.html

      [2]: https://www.youtube.com/watch?v=oDR4AHYRmlk

    • rootingforyou20May 2022

      OP, don't know you but rooting for you

      Re eating/getting healthier,

      1) food: this guy Rip is truly a lifechanger (esp if since you're in the zone when it would be smart to look after your heart: https://mealplanner.plantstrong.com/

      2) Lose weight (this approach might be appealing to your engineer'y instinct): https://www.fourmilab.ch/hackdiet/

      3) Exercise:

      - Warm up (DO THESE): https://www.youtube.com/watch?v=-QWyyHfARNI

      - Try to get through a round of this w/ good form + then try to do 2, 3, etc: https://www.youtube.com/watch?v=XTSIqbuZC0Y&t=369s

      I don't have any career advice for you, leaving is one option but consider that it would great for you to "skill-up" the people around you so when you leave it isn't like they lost their Golden-Boii, but rather bow out like a Bob Iger at Disney & leave them with a glorious future blah blah

    • somenameformeMar 2024

      This was my initial reaction as well, as I have complete disdain for the lowest common denominator approach to many things in modern society. But then something occurred to me - IMO one of the most well written scientific papers is Einstein's special relativity paper. [1] But it's absolutely a 'story mode' paper! A moderately educated individual could easily understand and follow the paper, even if they might not necessarily follow all the math. It just flows inordinately better than most modern papers - most of which are written on comparably simple and evolutionary (rather than revolutionary) topics.

      Of course this may be an issue of domain. I'm mostly interested in cosmology/astronomy/physics, where math is a tool rather than the object of the paper itself.

      [1] - https://www.fourmilab.ch/etexts/einstein/specrel/specrel.pdf

    • acqqDec 2023

      Here a paper can be found about running the "cards" created by Rainer Glaschick based on the program described in Lady Lovelace's Note G on a modified emulator of the Babbage's analytical engine:

      https://rclab.de/analyticalengine/lovelace_noteg_paper

      And the text by the author of that emulator about the authenticity of the emulator:

      https://www.fourmilab.ch/babbage/authentic.html

      Note that the sizes of what we would today call "registers" in what we would today call "ALU" were, per 1837 description 40, per 1864 description 50 decimal digits, much bigger than the number of mantissa decimals in common "float" (7) or "double" (15) floating point representations, and the assumption of the engine was to use fixed point decimal arithmetic.

    • teddyhJul 2022

      In 1988, Autodesk (makers of AutoCAD) was so impressed by the Xanadu project that they gave them financial backing, hoping to bring a product to market the following year. After four years without any progress, Autodesk gave up:

      > […] Come 1992, the “resources of Autodesk” were still funding “talent of the Xanadu team” which had not, as of that date, produced anything remotely like a production prototype—in fact, nothing as impressive as the 88.1x prototype which existed before Autodesk invested in Xanadu. On August 21, 1992 Autodesk decided to pull the plug and give its interest in Xanadu back to the Xanadudes.

      (Quoted from footnote linked from this page: https://www.fourmilab.ch/autofile/e5/chapter2_64.html)

    • shagieDec 2024

      From the original https://www.fourmilab.ch/hotbits/how3.html

      > To create each random bit, we wait until the first count occurs, then measure the time, T1, until the next. We then wait for a second pair of pulses and measure the interval T2 between them, yielding a pair of durations. If they're the same, we throw away the measurement and try again. Otherwise if T1 is less than T2 we emit a zero bit; if T1 is greater than T2, a one bit. In practice, to avoid any residual bias resulting from non-random systematic errors in the apparatus or measuring process consistently favouring one state, the sense of the comparison between T1 and T2 is reversed for consecutive bits.

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